Test: Compressors - 1 - Mechanical Engineering MCQ

Example of non-positive displacement compressor:
(i) Centrifugal compressor
(ii) Axial flow compressor
(iii) Dynamic compressor
(iv) Blade compressor

The reciprocating compressors are.suitable for low discharge (maximum limit 50 m³/min) at high delivery pressures (as high as 1000 bar).

Isothermal compression requires minimum power input.

Maintaining constant temperature requires large quantity of coolant water. Use of large coolant water makes compressor bulky and decreases the engine speed.

Most suitable choice is (b). Increase of clearance volume decrease the volumetric efficiency, so option (c) is wrong.

There is reduction in work required per stroke and therefore the total driving power is also reduced.

Hair dryer is either battery or electrically powered. Compressed air is used in a wide variety of applications where the use of electric motors or S.l. engines is not permissible and where high safety is required to bemet as in mining applications. Pneumatic breakers, picks, spades, rammers, vibrators, riveters etc. form a range of hand tools having wide use in construction work.